[Bug c++/107457] ICE when template lambda alias used as default template argument

["mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107457

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mpolacek at gcc dot gnu.org

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Another test for the same problem:

```
template <typename Type> using LambdaType = decltype([] {});
template <typename Type, typename = LambdaType<Type>> class S;
```

107457.C:3:25: internal compiler error: Segmentation fault
    3 | using lambda = decltype([]() {});
      |                         ^~~~~~~
0x1ac234a crash_signal
        /home/mpolacek/src/gcc/gcc/toplev.cc:319
0x7fd3f489099f ???
       
/usr/src/debug/glibc-2.38-16.fc39.x86_64/signal/../sysdeps/unix/sysv/linux/x86_64/libc_sigaction.c:0
0xeda764 begin_function_body()
        /home/mpolacek/src/gcc/gcc/cp/decl.cc:18398
0xf4eb05 start_lambda_function(tree_node*, tree_node*)
        /home/mpolacek/src/gcc/gcc/cp/lambda.cc:1700
0x1106d94 tsubst_lambda_expr(tree_node*, tree_node*, int, tree_node*)
        /home/mpolacek/src/gcc/gcc/cp/pt.cc:19748
0x11119fc tsubst_expr(tree_node*, tree_node*, int, tree_node*)
        /home/mpolacek/src/gcc/gcc/cp/pt.cc:21684
0x10f5523 tsubst(tree_node*, tree_node*, int, tree_node*)
        /home/mpolacek/src/gcc/gcc/cp/pt.cc:16895
0x10ef6e0 tsubst_decl
        /home/mpolacek/src/gcc/gcc/cp/pt.cc:15531
0x1113f4e instantiate_template(tree_node*, tree_node*, int)
        /home/mpolacek/src/gcc/gcc/cp/pt.cc:22100
0x1114a20 instantiate_alias_template
        /home/mpolacek/src/gcc/gcc/cp/pt.cc:22198
0x10f21c7 tsubst(tree_node*, tree_node*, int, tree_node*)
        /home/mpolacek/src/gcc/gcc/cp/pt.cc:16193
0x10cea1f lookup_template_class(tree_node*, tree_node*, tree_node*, tree_node*,
int, int)
        /home/mpolacek/src/gcc/gcc/cp/pt.cc:10204
0x116c376 finish_template_type(tree_node*, tree_node*, int)
        /home/mpolacek/src/gcc/gcc/cp/semantics.cc:3948
0x103d7eb cp_parser_template_id
        /home/mpolacek/src/gcc/gcc/cp/parser.cc:19048
0x104d762 cp_parser_class_name
        /home/mpolacek/src/gcc/gcc/cp/parser.cc:26655
0x1023508 cp_parser_qualifying_entity
        /home/mpolacek/src/gcc/gcc/cp/parser.cc:7400
0x10229d6 cp_parser_nested_name_specifier_opt
        /home/mpolacek/src/gcc/gcc/cp/parser.cc:7082
0x1040456 cp_parser_simple_type_specifier
        /home/mpolacek/src/gcc/gcc/cp/parser.cc:20491
0x103f70d cp_parser_type_specifier
        /home/mpolacek/src/gcc/gcc/cp/parser.cc:20142
0x104a146 cp_parser_type_specifier_seq
        /home/mpolacek/src/gcc/gcc/cp/parser.cc:25175